Add automatic aspect matching with explicit ratio overrides.

Keep video output on the still by default, and only force 16:9, 9:16, or 1:1 when a preset is selected.

server/api/generate.post.ts

@@ -1,13 +1,3 @@
-const ASPECTS: Record<string, { width: number; height: number }> = {
-  '16:9': { width: 1344, height: 768 },
-  '9:16': { width: 768, height: 1344 },
-  '1:1': { width: 1024, height: 1024 }
-}
-
-function snap32(value: number) {
-  return Math.max(32, Math.round(value / 32) * 32)
-}
-
 function frameLength(seconds: number) {
   const raw = Math.max(5, Math.round(seconds * 24))
   return raw + (5 - (raw % 17) + 17) % 17
@@ -37,9 +27,7 @@ export default defineEventHandler(async (event) => {
     throw createError({ statusCode: 400, statusMessage: 'A motion prompt is required' })
   }
 
-  const aspect = ASPECTS[fields.aspect] || ASPECTS['16:9']
-  const width = snap32(Number(fields.width || aspect.width))
-  const height = snap32(Number(fields.height || aspect.height))
+  const { width, height } = resolveOutputSize(fields.aspect, image.data, Number(fields.width), Number(fields.height))
   const turbo = fields.turbo !== 'false'
   const steps = Number(fields.steps || (turbo ? 8 : 20))
   const seed = fields.seed && fields.seed !== 'random'
@@ -64,6 +52,7 @@ export default defineEventHandler(async (event) => {
     seed,
     width,
     height,
+    aspect: fields.aspect || 'auto',
     steps,
     turbo
   }